A determination method of direct wave aoa in indoor multipath environment

A judgment method and direct wave technology, applied in positioning, radio wave measurement systems, instruments, etc., can solve problems such as unsatisfactory real-time positioning, TOF estimated value error, and imperfect propagation signal hardware

Active Publication Date: 2021-05-14
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the prior art, the CUPID system judges the AOA with the largest peak in the MUSIC spectrum as the AOA of the direct wave, but in the real environment, due to people moving around to block the propagation signal and hardware imperfections, the peak in the MUSIC spectrum with the largest peak is not necessarily corresponding to the direct wave
The LTEye system judges the path with the minimum estimated value of TOF (Time of Flight) as the direct arrival wave, but to estimate a relatively accurate TOF requires high-precision communication equipment, and current commercial communication equipment generally does not meet this standard. TOF The estimated value often has a large error, so the method proposed by the system cannot be well used in practice
The SpotFi system uses the results of multiple AOA estimates to determine the cluster with the smallest variance as the cluster corresponding to the direct wave through the clustering method, and the AOA average value of the elements in the cluster is used as the estimate of the AOA of the direct wave. The method works well, but the computational complexity is high, which cannot meet the real-time positioning requirements
The ArrayTrack system requires user participation when determining the direct wave AOA, and requires mobile sending equipment, which is difficult to apply in a large number of stationary equipment positioning scenarios

Method used

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  • A determination method of direct wave aoa in indoor multipath environment
  • A determination method of direct wave aoa in indoor multipath environment
  • A determination method of direct wave aoa in indoor multipath environment

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Embodiment

[0044] In this embodiment, the accuracy and effect of the direct wave AOA determination of the present invention are verified through actual experiments, and the specific hardware, parameters and test locations used are as follows:

[0045] (1) The sending end is a Dell laptop, equipped with two sending antennas, and the distance between the two sending antennas is 6cm. The receiving end is a Dell mini desktop computer equipped with three antennas, and Intel 5300NIC is installed in both the sending end and the receiving end to obtain CSI.

[0046] (2) The working frequency band of the transceiver is 5.2GHz, and the working bandwidth is 40MHz; the transmitter is set to injection mode, and the receiver is set to monitor mode to monitor the data packets of the transmitter to achieve stable acquisition of CSI at the transceiver.

[0047] (3) All data processing and direct wave AOA determination methods are implemented on the MATLAB platform.

[0048] Such as figure 1 Shown is a fl...

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Abstract

The invention discloses a method for judging direct wave AOA in an indoor multipath environment. The steps include: (1) the sending end is equipped with multiple antennas to send signals, and the receiving end estimates the channel between each sending antenna and the receiving end after receiving the signals. State information; (2) According to the channel state information, obtain the AOA-TOF estimated value of each path in the propagation path cluster of each transmitting antenna and the receiving end; (3) Set the threshold and select a path cluster arbitrarily from multiple path clusters as the initial path cluster; (4) select the path in the initial path cluster and judge the path, choose to keep the path or remove the path according to the judgment result; (5) traverse each path in the initial path cluster, and finally obtain the path The cluster is the reserved path cluster of the initial path cluster; (6) Output the estimated value of the direct wave AOA according to the path conditions in the reserved path cluster. The invention has high accuracy in judging the direct wave AOA in the indoor multipath environment, has small calculation amount, good real-time performance, and does not need user participation.

Description

technical field [0001] The invention relates to the field of wireless indoor positioning, in particular to a direct wave AOA determination method in an indoor multipath environment. Background technique [0002] With the popularity of mobile devices and the development of mobile Internet, positioning has become one of the important modules in many mobile applications. However, accurate indoor positioning is still a key missing part of the mobile Internet at this stage, and how to obtain accurate location information indoors has become a research hotspot in the academic circles. [0003] Compared with the current indoor positioning technology based on fingerprints, the positioning technology based on AOA (Angle of Arrival, angle of arrival) has gained widespread attention because it does not need to spend manpower and material resources to build a fingerprint database. In recent years, some commercial Wi-Fi devices such as Intel 5300 and Atheros 9380 have successfully obtain...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): G01S5/02H04B7/0413
CPCG01S5/02H04B7/0413
Inventor胡斌杰陈浩翔
OwnerSOUTH CHINA UNIV OF TECH